package com.bootdo.common.utils;

import java.security.MessageDigest;

public class Sha1Utils {
		
	
		//Sha1签名
		public static String getSha1(String str) {
			if (str == null || str.length() == 0) {
				return null;
			}
			char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
			'a', 'b', 'c', 'd', 'e', 'f' };
		
		
			try {
				MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
				mdTemp.update(str.getBytes("UTF-8"));
				byte[] md = mdTemp.digest();
				int j = md.length;
				char buf[] = new char[j * 2];
				int k = 0;
				for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
				buf[k++] = hexDigits[byte0 & 0xf];
			}
				return new String(buf);
			} catch (Exception e) {
				return null;
			}
		}
}
